(19)

(11)

EP 0 509 050 A1

(12)

(43) Date of publication: 21.10.1992 Bulletin 1992/43 (21) Application number: 91902925.0 (22) Date of filing: 20.12.1990

(51) International Patent Classification (IPC):  G02B 5/ 08( . ) G02B 1/ 10( . ) F24J 2/ 10( . ) G02B 5/ 26( . ) (86) International application number: PCT/US1990/007362 (87) International publication number: WO 1991/009329 (27.06.1991 Gazette 1991/14)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 20.12.1989 US 19890454749 (71) Applicant: VIRATEC THIN FILMS, INC. Fairbault, MN 55021 (US)	(72) Inventors: AUSTIN, Russell, R. Novato, CA 95120 (US) DICKEY, Eric, R. Beaverton, OR 97006-3477 (US) (74) Representative: Hall, Robert Leonard  Dibb, Lupton, Broomhead, Fountain Precinct, Balm Green Sheffield S1 1RZ Sheffield S1 1RZ (GB)